LG AMNW07GDBL1 Service Manual page 71

Part 5. Trouble Shooting
Display
Title
code
If the data transmitted by
the indoor unit is not
53
received for 3 minutes
continuously.
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
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Only for training and service purposes
Cause of error
• No power on indoor unit
• Indoor/outdoor unit
Power connection
error/communication
error caused by external
noise
• Indoor/outdoor unit com-
munication circuit parts
burned
Yes
Recheck power
and installation condition
Check point & Normal condition
• Check indoor unit power status
• Check indoor/outdoor unit
power/communication line disconnection
• Check the status of indoor/outdoor unit ground
connections
• Check if outdoor unit communication parts are
burned
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LGE Internal Use Only